Make sure to read dave_casa's comment here. That way, the next time you're at a nerdy party and someone asks you this question about two Ping-Pong balls, you'll be able answer it with aplomb. (r/askscience)

Reddit is unique among social sites in that it doesn't allow for much customization of your user profile: You get a username, karma scores, a comment history, and that's it. How does this shape the site? (r/TheoryOfReddit)